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                5G材料专题:常用高分子材料介电常数表

                发布日期:2019/6/27 15:48:55 访问次数:5588

                介质在外加电场时会产生感应电荷而削弱电场,介质中的电场减小与原外加电@场(真空中)的比值〒即为相对介电常数(relative permittivity或dielectric constant),又称诱电率,与频率相关。介电常数是相对介电常数与真空中绝对介电常数乘ξ 积。如果有高介电常数的材料放在电场中,电场的强〖度会在电介质内有可观的下降。理想导体(金属)的相对介电常数为无穷大

                 

                根据物质的介电常∩数可以判别高分子材料的极性大小。通常,相对介电常♂数大于3.6的物质为极性物质;相对介电常数在2.8~3.6范围内的物质为弱极※性物质;相对★介电常数小于2.8为非极性物质。

                 

                同理,我们根据高分子材料的极性也可以大致推测材料介电常数大小,极性Ψ 基团多,介电常数高,极性基团少介电常数小。下面是常见材料的介电常数的大小:

                 

                聚合物

                最低值

                最高值

                HIPS Flame Retardant V0

                2

                3

                PCTFE - Polymonochlorotrifluoroethylene

                2

                3

                PMMA - Polymethylmethacrylate/Acrylic

                2

                5

                FEP - Fluorinated Ethylene Propylene

                2.1

                2.1

                PFA - Perfluoroalkoxy

                2.1

                2.1

                PTFE - Polytetrafluoroethylene

                2.1

                2.1

                PMP - Polymethylpentene

                2.1

                3.6

                HDPE - High Density Polyethylene

                2.3

                2.3

                LDPE - Low Density Polyethylene

                2.3

                2.3

                LLDPE - Linear Low Density Polyethylene

                2.3

                2.3

                PMP Mineral Filled

                2.3

                2.3

                PP, 10-40% Mineral Filled

                2.3

                2.3

                PP, 10-40% Talc Filled

                2.3

                2.3

                PP (Polypropylene) Copolymer

                2.3

                2.3

                PP (Polypropylene) Homopolymer

                2.3

                2.3

                PP, Impact Modified

                2.3

                2.3

                UHMWPE - Ultra High Molecular Weight Polyethylene

                2.3

                2.3

                PMP 30% Glass Fiber-reinforced

                2.4

                2.4

                PS (Polystyrene) Crystal

                2.4

                2.7

                PS, High Heat

                2.4

                2.7

                HIPS - High Impact Polystyrene

                2.4

                4.8

                ABS High Heat

                2.4

                5

                ABS High Impact

                2.4

                5

                PS (Polystyrene) 30% glass fiber

                2.5

                2.5

                EVA - Ethylene Vinyl Acetate

                2.5

                3

                SAN - Styrene Acrylonitrile

                2.5

                3.4

                ECTFE

                2.57

                2.59

                ETFE - Ethylene Tetrafluoroethylene

                2.6

                2.6

                PP - Polypropylene 10-20% Glass Fiber

                2.6

                2.6

                PP, 30-40% Glass Fiber-reinforced

                2.6

                2.6

                PPE - Polyphenylene Ether

                2.7

                2.7

                PPE, Flame Retardant

                2.7

                2.7

                PE - Polyethylene 30% Glass Fiber

                2.7

                2.8

                ABS - Acrylonitrile Butadiene Styrene

                2.7

                3.2

                SMA - Styrene Maleic Anhydride

                2.8

                2.8

                ABS Flame Retardant

                2.8

                3

                MABS - Transparent Acrylonitrile Butadiene Styrene

                2.8

                3

                PC - Polycarbonate, high heat

                2.8

                3.8

                PPE, 30% Glass Fiber-reinforced

                2.9

                2.9

                ABS/PC Blend - Acrylonitrile Butadiene  Styrene/Polycarbonate Blend

                2.9

                3.2

                PMMA (Acrylic) Impact Modified

                2.9

                3.7

                PBT - Polybutylene Terephthalate

                2.9

                4

                PA 66, Impact Modified

                2.9

                5

                PC/PBT Blend - Polycarbonate/Polybutylene  Terephthalate Blend

                2.95

                3.14

                PTFE, 25% Glass Fiber-reinforced

                3

                3

                PSU - Polysulfone

                3

                3.2

                PPS - Polyphenylene Sulfide

                3

                3.3

                ASA/PC Blend - Acrylonitrile Styrene  Acrylate/Polycarbonate Blend

                3

                3.4

                PC (Polycarbonate) 20-40% Glass Fiber

                3

                3.5

                PC (Polycarbonate) 20-40% Glass Fiber Flame  Retardant

                3

                3.8

                CP - Cellulose Proprionate

                3

                4

                LCP Glass Fiber-reinforced

                3

                4

                PA 6-10 - Polyamide 6-10

                3

                4

                PBT, 30% Glass Fiber

                3

                4

                PEI, 30% Glass Fiber-reinforced

                3

                4

                PEI, Mineral Filled

                3

                4

                PET - Polyethylene Terephtalate

                3

                4

                PET, 30% Glass Fiber-reinforced

                3

                4

                PETG - Polyethylene Terephtalate Glycol

                3

                4

                POM (Acetal) Low Friction

                3

                4

                PVC Rigid

                3

                4

                PVC, Plasticized

                3

                5

                PVC, Plasticized Filled

                3

                5

                LCP Mineral-filled

                3

                5.9

                CPVC - Chlorinated Polyvinyl Chloride

                3

                6

                PVDC - Polyvinylidene Chloride

                3

                6

                CAB - Cellulose Acetate Butyrate

                3

                7

                CA - Cellulose Acetate

                3

                8

                PA 11, Conductive

                3

                9

                PA 11, Flexible

                3

                9

                PA 11, Rigid

                3

                9

                PA 12 (Polyamide 12), Conductive

                3

                9

                PA 12, Fiber-reinforced

                3

                9

                PA 12, Flexible

                3

                9

                PA 12, Glass Filled

                3

                9

                PA 12, Rigid

                3

                9

                SRP - Self-reinforced Polyphenylene

                3.1

                3.1

                ABS/PC Blend 20% Glass Fiber

                3.1

                3.2

                PEI - Polyetherimide

                3.1

                3.2

                PI - Polyimide

                3.1

                3.55

                ASA/PC Flame Retardant

                3.2

                3.2

                PEEK - Polyetheretherketone

                3.2

                3.2

                SMMA - Styrene Methyl Methacrylate

                3.2

                3.2

                PEEK 30% Carbon Fiber-reinforced

                3.2

                3.4

                SAN, 20% Glass Fiber-reinforced

                3.2

                3.8

                PMMA (Acrylic) High Heat

                3.2

                4

                LCP - Liquid Crystal Polymer

                3.3

                3.3

                PAR - Polyarylate

                3.3

                3.3

                PEKK (Polyetherketoneketone), Low Cristallinity  Grade

                3.3

                3.3

                SMA, 20% Glass Fiber-reinforced

                3.3

                3.3

                ASA - Acrylonitrile Styrene Acrylate

                3.3

                3.8

                PPS, 20-30% Glass Fiber-reinforced

                3.3

                3.8

                PC/PBT blend, Glass Filled

                3.3

                3.9

                PEEK 30% Glass Fiber-reinforced

                3.3

                4.2

                POM - Polyoxymethylene (Acetal)

                3.3

                4.7

                PPSU - Polyphenylene Sulfone

                3.4

                3.5

                PA 46 - Polyamide 46

                3.4

                3.8

                PA 66, Impact Modified, 15-30% Glass Fiber

                3.4

                4.2

                Amorphous TPI Blend, Ultra-high heat, Chemical  Resistant (Standard Flow)

                3.5

                3.5

                PESU - Polyethersulfone

                3.5

                4.1

                PA 66, 30% Glass Fiber

                3.5

                5.6

                PSU, 30% Glass finer-reinforced

                3.6

                3.7

                PPA, 33% Glass Fiber-reinforced – High Flow

                3.7

                3.9

                PARA (Polyarylamide), 30-60% glass fiber

                3.9

                4.5

                PAI - Polyamide-Imide

                3.9

                7.3

                PPS, 40% Glass Fiber-reinforced

                4

                4

                PPA, 30% Mineral-filled

                4

                4.2

                POM (Acetal) Impact Modified

                4

                4.3

                PA 46, 30% Glass Fiber

                4

                4.6

                PA 6 - Polyamide 6

                4

                5

                PA 66 - Polyamide 6-6

                4

                5

                PA 66, 30% Mineral filled

                4

                5

                PESU 10-30% glass fiber

                4.2

                4.3

                PAI, 30% Glass Fiber

                4.2

                6.5

                PPA - Polyphthalamide

                4.3

                4.3

                PPA, 33% Glass Fiber-reinforced

                4.4

                4.6

                PPA, 45% Glass Fiber-reinforced

                4.4

                4.6

                PA 11 - (Polyamide 11) 30% Glass fiber reinforced

                4.8

                4.8

                EVOH - Ethylene Vinyl Alcohol

                4.8

                5.6

                PPS, Glass fiber & Mineral-filled

                5

                5

                PVDF - Polyvinylidene Fluoride

                6

                9


                目前大家探讨比较多是5G工程塑料,主要分为薄膜产品(LCP,PI等用在线路≡板,天线)、还有就是结构件(注塑成型),如低介电LCP、PBT、PPO、PPS等。选材中既要满足介电常数低又要满足力学性能、化学性能、电性能等因素。改性塑『料的介电常数跟基材的分子结构有关,同时也跟增强/填充材料的介电常数有关


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